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Mobile Ad Hoc Networks have evolved rapidly and are finding numerous applications in the areas of self-creating, self-organizing and self-administering wireless networks. The present paper describes use of and comparison of three routing protocols. The parameters used for comparison are throughput and delay in response by varying the number of mobile nodes. A random waypoint mobility model was used for fixing the mobile nodes. The simulation study is carried out using OPNET modeler 14.5. Simulation result shows that for increasing number of mobile nodes OLSR offers better throughput and minimum delay than AODV and GRP routing protocols.